We have a two car garage that is organized and could easily fit at least one car, but we don't park either car in the garage right now. The BBQ grill is in there and gets pulled out in the driveway to grill when we need it, the bikes and lawn mower are in there as well. The kids use the space to play and much of the time we park the cars on the street to where the driveway is blocked off (people tend to turn around in our driveway a lot, and this keeps them from doing that while the kids are playing). Our kiddie pools get stored there in the summer too.
We keep lawn chairs in there set up too so we can sit and watch the kids play. Our backyard gets so muddy after it rains, plus we find we like the front because we tend to interact with the neighbors more often than if we just play in the backyard.
I've also found that my car tends to get more cluttered when I leave it in the garage because I can always "run right out and get what I need" from it (which doesn't happen, it just gets cluttered). But if I park in the driveway I tend to keep everything in a bag and carry it from the house to the car each time we go somewhere.
This winter we might push everything to the side and park in the garage, at least when it is going to snow, but not sure. It might be nice to have the space for the kids to ride bikes and skate in there.